linux-kernel - Re: [PATCH 6.6 000/122] 6.6.28-rc1 review

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Date: Wed, 17 Apr 2024 09:05:12 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Catalin Marinas <catalin.marinas@....com>
Cc: Marc Zyngier <maz@...nel.org>,
	Naresh Kamboju <naresh.kamboju@...aro.org>,
	Mark Brown <broonie@...nel.org>, stable@...r.kernel.org,
	patches@...ts.linux.dev, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	linux@...ck-us.net, shuah@...nel.org, patches@...nelci.org,
	lkft-triage@...ts.linaro.org, pavel@...x.de, jonathanh@...dia.com,
	f.fainelli@...il.com, sudipm.mukherjee@...il.com,
	srw@...dewatkins.net, rwarsow@....de, conor@...nel.org,
	allen.lkml@...il.com, Yihuang Yu <yihyu@...hat.com>,
	Gavin Shan <gshan@...hat.com>, Ryan Roberts <ryan.roberts@....com>,
	Anshuman Khandual <anshuman.khandual@....com>,
	Shaoqin Huang <shahuang@...hat.com>, Will Deacon <will@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	Anders Roxell <anders.roxell@...aro.org>
Subject: Re: [PATCH 6.6 000/122] 6.6.28-rc1 review

On Tue, Apr 16, 2024 at 06:28:10PM +0100, Catalin Marinas wrote:
> On Tue, Apr 16, 2024 at 02:22:07PM +0100, Marc Zyngier wrote:
> > On Tue, 16 Apr 2024 14:07:30 +0100,
> > Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
> > > On Tue, 16 Apr 2024 at 16:04, Mark Brown <broonie@...nel.org> wrote:
> > > > On Mon, Apr 15, 2024 at 04:19:25PM +0200, Greg Kroah-Hartman wrote:
> > > > > This is the start of the stable review cycle for the 6.6.28 release.
> > > > > There are 122 patches in this series, all will be posted as a response
> > > > > to this one.  If anyone has any issues with these being applied, please
> > > > > let me know.
> > > >
> > > > The bisect of the boot issue that's affecting the FVP in v6.6 (only)
> > > > landed on c9ad150ed8dd988 (arm64: tlb: Fix TLBI RANGE operand),
> > > > e3ba51ab24fdd in mainline, as being the first bad commit - it's also in
> > > > the -rc for v6.8 but that seems fine.  I've done no investigation beyond
> > > > the bisect and looking at the commit log to pull out people to CC and
> > > > note that the fix was explicitly targeted at v6.6.
> > > 
> > > Anders investigated this reported issues and bisected and also found
> > > the missing commit for stable-rc 6.6 is
> > > e2768b798a19 ("arm64/mm: Modify range-based tlbi to decrement scale")
> > 
> > Which is definitely *not* stable candidate. We need to understand why
> > the invalidation goes south when the scale go up instead of down.
> 
> If you backport e3ba51ab24fd ("arm64: tlb: Fix TLBI RANGE operand")
> which fixes 117940aa6e5f ("KVM: arm64: Define
> kvm_tlb_flush_vmid_range()") but without the newer e2768b798a19
> ("arm64/mm: Modify range-based tlbi to decrement scale"), it looks like
> "scale" in __flush_tlb_range_op() goes out of range to 4. Tested on my
> CBMC model, not on the actual kernel. It may be worth adding some
> WARN_ONs in __flush_tlb_range_op() if scale is outside the 0..3 range or
> num greater than 31.
> 
> I haven't investigated properly (and I'm off tomorrow, back on Thu) but
> it's likely the original code was not very friendly to the maximum
> range, never tested. Anyway, if one figures out why it goes out of
> range, I think the solution is to also backport e2768b798a19 to stable.

How about I drop the offending commit from stable and let you all figure
out what needs to be added before applying anything else :)

thanks,

greg k-h